sorear changed the topic of #riscv to: RISC-V instruction set architecture | https://riscv.org | Logs: https://libera.irclog.whitequark.org/riscv | Matrix: #riscv:catircservices.org
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<drewfustini> palmer: does this patch from august look okay to you?
<drewfustini> It makes ZONE_DMA32 optional. I have system with memory starting above 4GB so it would be nice to have this
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<palmer> drewfustini: I just replied
<drewfustini> thanks!
<drewfustini> ah, so it seems we need to keep for the HiFive Unleashed?
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<palmer> I'm not entirely sure -- we just need some way to do the low-memory stuff
<palmer> I think we could also just dynamically probe for the no-lowmem stuff and turn off DMA32?
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<drewfustini> do you mean check the base address of the memory to see if there is any below 4GB?
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<ganboing> Some devices require the DMA address to be <4G. It's a per platform/device thing, not riscv.
<jrtc27> surely you want to only whine in the boot log when a device actually needs 32-bit DMA?
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<jrtc27> what happens on arm64? IIRC if you use Hypervisor.framework on macOS you only get high memory
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<bjdooks> the dma32 stuff was a pain with some or the horsecreek as it had nothing in the 32bit memory space
<bjdooks> the unmatched has a small area that gets mirrored into 4G
<bjdooks> ganboing: possibly legacy pci devices, but that'd be it from what i've seen in a long time
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<drewfustini> I think the patch above just makes it possible to turn off ZONE_DMA32 for platforms like the one I have where I do not have any memory under 4GB. Currently, I have a downstream patch to remove that "select ZONE_DMA32 if 64BIT"
<bjoto> drewfustini: Have you looked at https://lore.kernel.org/all/cover.1723359916.git.baruch@tkos.co.il/ (landed in 6.12 AFAIU)
<drewfustini> very interesting, thanks
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<drewfustini> I really just want to be able to not set CONFIG_ZONE_DMA32 in .config which this patch allows me to do. The defconfig still sets CONFIG_ZONE_DMA32=y
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